macOS compatibility

cmake/basic-setup.cmake

@@ -8,7 +8,7 @@
 SET(LINUX   ${UNIX})
 SET(WINDOWS ${MSVC})
 SET(MAC     ${APPLE})
-IF(CMAKE_CXX_COMPILER MATCHES ".*clang.?.?")
+IF(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
     SET(CLANG ON)
     SET(COMPILER CLANG)
     SET(GCC OFF)